Microwave runs but does not heat food; turntable and light work, timer counts down normally.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Critical safety warning: The high-voltage section is extremely dangerous. Do not attempt to test or replace the magnetron, capacitor, diode, or transformer unless you are a trained technician. Always unplug the microwave before any inspection.
User-level verification:
- Confirm that you are not in demo mode (if your Commercial Chef model supports it). Demo mode will run the timer and light without heating.
- Test with a microwave-safe cup of water for 1–2 minutes. If the water remains cold, the unit is not heating.
Next steps: Internal diagnosis involves testing the magnetron, high-voltage diode, capacitor, and transformer with specialized procedures. For safety and cost reasons, most users should either contact a professional appliance technician or replace the microwave.